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CTEK MXS 3.8 repair

Discussion in 'Troubleshooting and Repair' started by bushtech, Aug 21, 2018.

  1. 73's de Edd

    73's de Edd

    2,580
    1,057
    Aug 21, 2015
    Yep . . . . no voltage ( high millivolts) across R4 until FET gate receives drive pulses . . . and just for those short durations .
    Back to you after I solve the double dot dithering problem on an APQ117 stealth radar . . . .
     
    bushtech likes this.
  2. bushtech

    bushtech

    867
    138
    Sep 13, 2016
    Wow! Way above my pay grade and NSA clearance:rolleyes:
    Impressed!
     
  3. bushtech

    bushtech

    867
    138
    Sep 13, 2016
    Remeasured the voltage carefully on the gate of the 04N60C3 and it's in the high 80's mV
     
  4. bushtech

    bushtech

    867
    138
    Sep 13, 2016
    @73's de Edd
    I am trying to understand how this works.

    Does a signal/voltage from pin 5 (Drv) on the NCP1271A go through the 2 transistors A6W and 2F and then go to the Gate of the 04N60C3?
    I am reading 21mV DC on pin 5 (Drv) Do I need a higher voltage here?
     
  5. bushtech

    bushtech

    867
    138
    Sep 13, 2016
    @73's de Edd

    Been checking the complimentary (A6W & 2F) pair of transistors in situ
    These are smd transistors in which I have assumed a pinout as follows:

    c
    b e Please tell me if this is wrong in which case all below is rubbish

    2F transistor
    Red probe on base:
    b - c 1900
    b - e 1950
    Black probe on base:
    b - c 600
    b - e 600

    A6W transistor:
    Red probe on base:
    b - c 600
    b - e OL
    Black probe on base:
    b - c 750
    b - e OL

    o_O A6W fubar?

    St Edd, I hope you have kicked the radar till the double dithering is a frightened whimper:)
     
  6. bushtech

    bushtech

    867
    138
    Sep 13, 2016
    Anybody who can help me here?
     
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